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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826be496cba94a879282e1146e65c74cf954da5af2fe1c576f2b260de36a31b6' 
  AND token = 'h2dism86FAHb17E/NOTC8imtHdqQAjSKEpjKoYIAa9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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