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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b537d6cf250851422c06db4e85921e253682924ecb3f3eea75ec21bac95f522' 
  AND token = '82hLKozpO/3zEdPWZzxKmLtOU9DvzcVwaBdF0c808ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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