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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da6cb38f5c70e0c337b7b98061f87c262a252a6fa9f41569a11f35fc29ebf4b' 
  AND token = 'ZlVVRUof9VE/KQU6FukXVNe/tYxUNbbzuvzuQZv8SKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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