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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b1fc1d5d2a7c282cf759c92ee1558c8c0731d4ca2134e095736cbea810cdfd' 
  AND token = 'JU5Sciw9cET7KpFDNoIwVeu2KChuTHozkv8LxAKhSqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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