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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc05b1971d92b6671f7793efaa2c995af023b14fa628869076f0cecbbc18eff' 
  AND token = 'fF2oE7g4JqoFeGFV4NCsHcDCikR0ZyeUFLRSsyO2aQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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