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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cabeaf1bef3720c3a2e6eda819929982ad9fc29262a3183a782c9ff356180b' 
  AND token = '4MljdejGIO+oAkJrWAoKF76akFB76Gyh9d18frXnKO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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