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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873aba0e59893f2158d9a159edb87cd632d61cae4d3219e648d849224236a6f2' 
  AND token = '485KiytHDOjZl6NHsw67VJfwUnDcRk/TBk7kp/PASKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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