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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7746ecf64d893792cd9a2ff9a0f3840042d754c0b72e3654ab66c502bb3d9554' 
  AND token = 'Jx2tPHerMEIaXndM9uDmmcMfRxumB49ZXGKHL1TjwoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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