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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a5fed7ef2a893ec0cb9fc8df352519aaf2d162a3fbbd8d6bd5ca89f1dc2b44' 
  AND token = 'iRzebys9XqfKsWLGAgH4smFG3wmt9zeZvy8/y56jK4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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