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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b077c4be4613dfa92ee6d77e90ca9e4813408b245d671cd4fb33671cd77aa64' 
  AND token = 't1jldFGPjMiGla34rkpCfvqfN9XdOsahEO7VOd2obRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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