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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d4c0f0bee893df5bdc2c7a1d7a6e4b2339dff44b02da437babd32d0aa80409' 
  AND token = '672Zp4B0dlwVSGIAgwuHW+XRX3vYiUn84sgzM6wjwmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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