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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd955dac0d6bc95e4f1ceede7819780eeefe8ee8b1355474212e571869b7b7222' 
  AND token = 'o4xt1KPOHd306+XUKW7/d+56O11o6bKVhBS3bF6R3Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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