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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f894e886cfc248d2945c1cc80877d3b16b8af75811de2690842d0062d3be82' 
  AND token = '7qZYwiVlrVpvDG86yzMVbrPwDg2MT1I40E95H8VT3mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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