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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc47fcd7be67e31df955a2c15ce3d05d9eb4b5df45b4e9dda8136063ffa4e225' 
  AND token = 'Eie7gijF9kJqPEnmlL5Qzl7XGHFixT1uBpDso9XUI+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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