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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd39249629c82d02ae7be5dca7d3945903cdb8aacb7c3b7e285ed3b804271ac' 
  AND token = 'mY5j6/sIXzmeX4IQjqhYOpWoRCDt4ipFXt67krn5JHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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