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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab19622b769dac62e670c20a455c0a2eb054e1bc9874a35842316b6db5b606b' 
  AND token = '0g7jx0qNqOW6eBTD+Ne6tCE70feXB/NaShU8rOejtyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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