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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e633103d776541b643d5da0fc5efbc3217fe9b03f4da2e892b1a10e177cd089b' 
  AND token = 'OPNyvL0JHpNTqukSqkMZNQaVs8MpDY6+uSLQlFzSnP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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