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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb6e684c66c972564955a1cba36623ebbd9d40487597b9c4ca0abed67576d24' 
  AND token = 'pxAfQcYrHY9JNjn8X+MZ5UNuu585Fxp48lyBzDUkq2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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