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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985abc86353aee4b5d0bcb1ab53f6e4cdd678fa05d92c6a020c127ae29b323c9' 
  AND token = 'O3TYYh7pKK6pEjJe9LjzrWDQBC6XtnZ5ja9HuR25V04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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