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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3989bbb9ddc37c3d81101ce0e4141eec6d77cfd5170e296f11f0acb14625c24' 
  AND token = 'w1qg0JmXE+/XPNtky4n3DSb23QOjb46dBbAVWlDNR0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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