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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b71f6e8f044a1417da2094c7cec4f5655619a72167ff1d727eecf63b4570d71' 
  AND token = 'RDyjciwuZgOMkNUmGo8OYTTgFg7QVh4kkmkA/xUZE5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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