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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928b9a7107f42479aa64182f3666e24cc98ac68a5615cca9fdcd74adc5ae55da' 
  AND token = '9uozXj6gr2ayejc+B7PxH5QTIcWTV8WwubTz9oM6YeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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