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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f99febb11f3b9ba0075ac3ef4450aefef0a2c11b7dab6623c4510c2add62c7' 
  AND token = '1qs5Qjv9Vbgf1xdBu7KA840PB6hDaH0XUnVqxFrP9/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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