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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5295a06b5fa2b1b30c82ea317578a0b4932ab0585f370439228bcb1f41c2e2fd' 
  AND token = 'dDPRs5QvAzwTXgYjQ79kp17HkWgkHIWxnJklmP6fdws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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