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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666012318ca806084b6d0afb9c9dfa0bf0019dd3b52ee3c100606b8ea8f7786f' 
  AND token = 'yWvmf/8soZHjie97XTd2Mzx5MlAvHScAIVQE+5KduSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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