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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1217b798c0291f6d8db91696fc8c7e97c2539f0a94f77de2a00d01915b554f' 
  AND token = 'm0G6ekKZn3/yKp6CuUBVhsHblLsylZjLdkam+tdy0AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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