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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bfc1fd9c8b1b7e75be23eeeb86506fe2adc62596558dbf8a5942bac732628c' 
  AND token = 'n4jmPUC2OvtdeBhZJkAQMy0jBE+4f9hvdy6Tgac3Htc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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