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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8e1de94a60e00029f7b33cbac3fa6ec89b7b94568edd99d63d16eccf060e19' 
  AND token = 'uVWR8BMfueDZzu6eXjClqCBK8BPhWrH/R9+7A+bznaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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