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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74acdf8659d30d64d4f45808f041e260ea6971e1c8da96f3dbbb18f821b9f387' 
  AND token = '5n1ETbQ99YFNYv5rH86CdzFAoZadDpfHMrINuM6sclk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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