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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb7b34d97cf15b0a499087ffd4ffa6615c6847ffb761d61250d60281d4475aba' 
  AND token = 'XZ3Bv+W3+8y9wQ9F8sr4+olQjl3MZm8hl1EZx6YAwlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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