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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cee4aa0b360c1d37c8a69e3ee68730171a76c966596b1bab7de8e702b256c0' 
  AND token = '5jNk80BFOuXZZDKDzGp3Rjd+r0NTkE5nA+zCcaqsrlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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