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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a14327fb23b19c3cc3396e90407424585ac2f710918d481ac3dcf2c75b71334' 
  AND token = 'HSCF2/xp/pej478h2wxCyQAzRn4eCiHnTu5ZuIS/k/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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