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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be353a3dfcf16f39fcf02381ab8a2280e3251e95a1cbaf57c8cd8ca2da29a190' 
  AND token = 'fi239EkzQN5yoHzFMLeZfAuU4QsbdvOuIFtvMDO+Oq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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