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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11d60ba5bf95ac511b6192579bfd9f974db6317406b1190281fcc6a15b6ee0a' 
  AND token = 'NALAEGtJMW3czEYJaqb07pvK12K4g/KzN7BJcBhdn28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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