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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc8c5e4955a1bc38769f2837f6206dc5988aedfcae9df4cbf1938f0fe973a06' 
  AND token = 'Z59xfBh5RTwWwIFY1HfWSkpI6A29U04YBQjajZE89po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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