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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06830aa89a2adaff454d27bdc7b5e7c551a6f40b11e7f719ad26cee02c59969' 
  AND token = 'xGnumwaNaRNWN1w6Yo5ilCewjVa/BhNxp6MuPEPvvx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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