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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7fb940e664ddc2cb970f1c4772bcb0064a05203f1204b2928d88393291a856' 
  AND token = 'DdJaSHwEajBTH9q3RttMLnlxQsead9iOFRh8EOs9JZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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