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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de96e37e6b79fdd75a3c51756d5477a5207e7519d81c06f22f0ba62c3b93454c' 
  AND token = 'S7V1bN/ozMawuTk/46ks5gqKQNbb7pLGg9Cw31gMsNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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