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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac40efe349f84ce967eb264a7486f1b4958eb5427bb5fccf09a91ad14fc8e62c' 
  AND token = '8crrYAxD84g5zh2Op325m+h8n3ag9l3TJeMT6yYkP4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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