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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d37ebd771c7f2d6dda4da71137d29164da69e316f1d14b45585cd1a8565c0d5' 
  AND token = 'xneZGtvceocmypPon50rpCFgWzcJClVClfP5vauqxcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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