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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73c350ac0b8ced70c0d8742a95ec1544f5afbdfc07294e84f3d6b9fd8aea618' 
  AND token = 'XByuQSLh5S7/vOCjzRxUJDI8srDXq2eAk6bmInnsuSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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