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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd9de03f169333cdcf07bb24f630c7a75f340865de0d9be62d3b9b034a039cc' 
  AND token = 'CKZBBfv+/rMGXozcA+UcvUAwj6BYi8P+g4f8Imjt4Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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