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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591c2ab2b0e74d531d1dc3d8ff38b3905423b163567535dbdb21b508e93673d3' 
  AND token = 'Hnaf6hS4xSMthOzld6IS0I2diDg2AOA7Qvr2nshwp5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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