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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a27d7ae67058ec511d4cc2e11ce65f110622b9d2c53f8391c45f3b453def20' 
  AND token = 'AKDf3jdcWiLTrIpxE01gdIOtortT52hMhn+MMTCbl3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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