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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ad5e4884396e4096c210639e82c1465604562b4a584c0d66cb9ea447097335' 
  AND token = 'tNbtBoep7JW/E5e33Gqc+yuH3xBbHeUBAHVm3Tp7gMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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