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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea29835a0708e70ff697da1f25c5a85a7c7ceffc6349dc630b74a42246210c07' 
  AND token = 'b/zaunSyCVkc9CgpMZJ9DqiTrY4cq8EGbQzNclQ1qRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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