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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951ec34d4600d7d1545186bdab72c2834bc658c88e5b1b9133af834879aa93c3' 
  AND token = 'Le4EdjUfNw9RF2cwAf1DldqdCyx+opRthoLEe9WOoCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}