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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc71c2ebe6f71dc972a19e35ed7e866620cf80290d6534c2f1cc05b57e8c43c' 
  AND token = '8JnxLY6sE8Lz0YxbngzXk1rTs4kf9viU9Aj60CF63TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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