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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cadcd98bba12490fbce4be86798f8b2db28297b2333829b0eb3c045083f691d' 
  AND token = '1Zhdr279h7WWw/Kupv4yfAq1ycpqC9i4kSBGlfMO7bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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