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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a73b2af5557d14e446769c3c949b89142dc0ae0525d01e64fab4e3d8c05d11' 
  AND token = 'neVsAPcPhmzmupUlK7fLP7R/eNlR1pfPB1SGlGyLIac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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