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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b1df28304275beb2da643baf3f315a2f7ba58a6be1b840189bcce1fcc0188fa' 
  AND token = '6ARw1oit8L4DuacJhTiQ5mtKg+wL3WGnYKlKonv7bNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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