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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5350e6bab6cec8427a78c5f54ba4b48397cc83e12fd7db36c5e58d06deb91ef1' 
  AND token = 'A0FMtxNwZ37NCeIW7y7y1e47VLFjJlEVb7H6GyolpLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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