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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a92bf833c36db33dadf27a8dcbf21ab47541e6a46c77f1fe2cb4c65cba53a4a' 
  AND token = 'kL4msx4L4xe25OWKi0YgqbQAVm3ROk77xettsB95GfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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