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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fbe040b146948a1f5b6142e35079d9ed238d9928c20b9730e3680cf2f14e66b' 
  AND token = '6RaF818O+RtEdmA+W5XbRWkCloWYZS9yfaY2NOARCBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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